#include<iostream>
using namespace std;
int main()
{
    int n;
    int sum=0;
 
    cin>>n;
    if(n<0)
    {
        cout<<"-";
        n=-n;
    }
    while(n)
    {
        sum=sum*10+n%10;
        n/=10;
    }
    cout<<sum<<endl;
    return 0;
}

#include<iostream> using namespace std; int main(){ int input; cin>>input; if(input0){ cout<<0; return 0; } if(input<0){ cout<<'-'; input=-input; } while(input%100){ input/=10; } while(input!=0){ cout<<input%10; input/=10; } return 0; }

#include<iostream> using namespace std;

int n,ans;

int main() { cin>>n; if(n<0) { n=-n; cout<<"-"; } while(n!=0) { ans=ans*10+n%10; n/=10; } cout<<ans; return 0; }

#include <iostream>
#include<iomanip>
#include <cmath>
using namespace std;
int n,ans;
int main(){
	cin >> n;
	if ( n<0 ){
		cout << "-";
		n=-n;
		
	}
	while ( n ){
		int ge = n%10;
		n/=10;
		ans =ans *10 +ge;
	}
	cout <<  ans;
	return 0;
}

```

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin>>n;
	int tag=0;
	while(n)
	{
		tag=tag*10+n%10;
		n/=10;
	}
	cout<<tag;
	return 0;
}

#include<iostream>
using namespace std;
int main()
{
    int n;
    int sum=0;
 
    cin>>n;
    if(n<0)
    {
        cout<<"-";
        n=-n;
    }
    while(n)
    {
        sum=sum*10+n%10;
        n/=10;
    }
    cout<<sum<<endl;
    return 0;
}